3AG 1.5-R Equivalent & Substitute Parts

Part Overview

The 3AG 1.5-R is a 1.5 A, 250 V AC/DC fast-blow glass cartridge fuse manufactured by Bel Fuse Inc. This component is designed for circuit protection in applications requiring a 3AB/3AG form factor with a 1/4" x 1-1/4" package. The part is currently active in production with 1849 units in stock. Substitute parts are identified when equivalent electrical ratings, mechanical dimensions, and package specifications align with the original component, enabling direct replacement in holder-based fuse applications.

Substiute Parts

3AG 1.5-R

Bel Fuse Inc.In Stock: 18743AG 1.5-R Datasheet

Current PartRFQ

FSA-1.5A

OptiFuseIn Stock: 5735FSA-1.5A Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 3AG 1.5-R is determined by strict alignment of the following parameters:

• Current Rating: 1.5 A (exact match required)
• Voltage Rating (AC): 250 V (exact match required)
• Fuse Type: Cartridge, Glass (exact match required)
• Response Time: Fast Blow (exact match required)
• Package / Case: 3AB, 3AG, 1/4" x 1-1/4" (exact match required)
• Size / Dimension: 0.250" Dia x 1.252" L (exact match required)
• Operating Temperature Range: -55°C ~ 125°C (exact match required)

The FSA-1.5A from OptiFuse meets all substitution criteria and is classified as a parametric equivalent.

Parameter Comparison

Engineering Selection Recommendations

Both the 3AG 1.5-R and FSA-1.5A are active products with ROHS3 compliance. The 3AG 1.5-R carries CE, CSA, cULus, and PSE approvals with a breaking capacity of 200 A at rated voltage. The FSA-1.5A carries cULus and UL 248 approvals with a breaking capacity of 100 A at rated voltage. Selection between these parts should be based on application-specific approval requirements and breaking capacity specifications. Both components are suitable for direct substitution in 3AB/3AG holder-based circuits where the electrical and mechanical parameters align with design specifications.

Frequently Asked Questions (FAQ)

Q: Can the FSA-1.5A replace the 3AG 1.5-R in all applications?

A: The FSA-1.5A is a parametric equivalent with matching current rating, voltage rating, fuse type, response time, package, dimensions, and operating temperature range. However, the breaking capacity differs (100 A vs. 200 A). Verify that the application's breaking capacity requirement does not exceed 100 A before substitution.

Q: Are the physical dimensions identical?

A: Yes. Both parts have identical dimensions of 0.250" Dia x 1.252" L (6.35mm x 31.80mm) and fit the same 3AB/3AG holder.

Q: What approval agencies certify each part?

A: The 3AG 1.5-R is certified by CE, CSA, cULus, and PSE. The FSA-1.5A is certified by cULus and UL 248. Confirm that the required certifications for your application are present before selection.

Q: Do both parts require a holder for installation?

A: Yes. Both the 3AG 1.5-R and FSA-1.5A are cartridge fuses that require a 3AB or 3AG holder for installation.

Q: What is the difference in breaking capacity?

A: The 3AG 1.5-R has a breaking capacity of 200 A at rated voltage, while the FSA-1.5A has a breaking capacity of 100 A at rated voltage. Breaking capacity indicates the maximum fault current the fuse can safely interrupt. Select based on your circuit's maximum fault current specification.